nipple mouse: n. Var. clit mouse, clitoris
Common term for the pointing device used on IBM ThinkPads and a few other
laptop computers. The device, which sits between the ‘g’ and
‘h’ keys on the keyboard, indeed resembles a rubber nipple
intended to be tweaked by a forefinger. Many hackers consider these
superior to the glide pads found on most laptops, which are harder to
control precisely.